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cleanup: `Span::new` -> `Span::with_lo` Extracted from https://github.com/rust-lang/rust/pull/84373 as suggested in https://github.com/rust-lang/rust/pull/84373#issuecomment-857773867. It turned out less useful then I expected, but anyway. r? `@cjgillot` `@bors` rollup
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.